Global Patent Index - EP 2171003 A1

EP 2171003 A1 20100407 - METHOD FOR THE PRODUCTION OF A NANO-SCALE SILICON DIOXIDE

Title (en)

METHOD FOR THE PRODUCTION OF A NANO-SCALE SILICON DIOXIDE

Title (de)

VERFAHREN ZUR HERSTELLUNG EINES NANOSKALIGEN SILICIUMDIOXIDS

Title (fr)

PROCÉDÉ DE PRODUCTION D'UN DIOXYDE DE SILICIUM NANOMÉTRIQUE

Publication

EP 2171003 A1 20100407 (DE)

Application

EP 08759154 A 20080610

Priority

  • EP 2008004634 W 20080610
  • EP 07014926 A 20070730
  • EP 08759154 A 20080610

Abstract (en)

[origin: EP2025722A1] Preparing nanoscale silicon dioxide comprises: (a) providing an aqueous suspension of colloidal silicon dioxide with an average particle size of 1-500 nm; (b) reacting the suspension with an organosilane or organosiloxane in an aprotic cyclic ether and silanizing the colloidal silicon dioxide; (c) separating the aqueous phase of the mixture from the organic phase; (d) reacting the organic phase again with an organosilane or organosiloxane in an aprotic cyclic ether and silanizing the colloidal silicon dioxide; and (e) separating the aqueous phase of the mixture from the organic phase. An independent claim is included for a redispersible nanoscale silicon dioxide powder obtained by the above process.

IPC 8 full level

C09C 1/36 (2006.01); C09C 1/30 (2006.01)

CPC (source: EP US)

B82Y 30/00 (2013.01 - EP US); C09C 1/3081 (2013.01 - EP US); C01P 2004/64 (2013.01 - EP US)

Citation (search report)

See references of WO 2009015724A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

Designated extension state (EPC)

AL BA MK RS

DOCDB simple family (publication)

EP 2025722 A1 20090218; CA 2694890 A1 20090205; CN 101809095 A 20100818; CN 101809095 B 20130717; EP 2171003 A1 20100407; EP 2171003 B1 20130327; JP 2010534616 A 20101111; JP 5507458 B2 20140528; KR 101492665 B1 20150212; KR 20100040945 A 20100421; US 2010233060 A1 20100916; WO 2009015724 A1 20090205

DOCDB simple family (application)

EP 07014926 A 20070730; CA 2694890 A 20080610; CN 200880024075 A 20080610; EP 08759154 A 20080610; EP 2008004634 W 20080610; JP 2010518512 A 20080610; KR 20107004387 A 20080610; US 67119408 A 20080610